Stuffed Shells with Spinach Ricotta

This is my favorite recipe for stuffed shells. I've made them several times now, and my family loves the flavor from the lemon and cinnamon. It's nice and refreshing. I only use half an onion, though, otherwise it's overpowering and the texture can be weird. Sometimes I add plant based beef crumbles to the sauce and that's surprisingly good as well, but it's delicious without too.